Phosphors with different morphology, formed under hydrothermal conditions on the basis of ZrO2:Eu3+ nanocrystallites

A.N. Bugrov – Institute of macromolecular compounds RAS, Bolshoy pr. 31, 199004 St. Petersburg; Saint Petersburg Electrotechnical University “LETI”, ul. Professora Popova 5, 197376 St. Petersburg, Russia; alexander.n.bugrov@gmail.com
R.Yu. Smyslov – Institute of macromolecular compounds RAS, Bolshoy pr. 31, 199004 St. Petersburg; Peter the Great St. Petersburg Polytechnic University, Polytechnicheskaya 29, 195251 St. Petersburg, Russia; urs1968@gmail.com
T.V. Khamova – Grebenshchikov Institute of Silicate Chemistry RAS, Makarova nab. 2., letter B, 199034 St Petersburg, Russia; tamarakhamova@gmail.com
D.A. Kirilenko – Ioffe Institute RAS, Politekhnicheskaya ul. 26, 194021 St. Petersburg; ITMO University, Kronverskii avenue 49, 197101 St. Petersburg, Russia; demid.kirilenko@mail.ioffe.ru
I.A. Rodionov – Institute of Chemistry, Saint Petersburg State University, Universitetskii prospect 26, Petergof, 198504 St. Petersburg, Russia; i.rodionov@spbu.ru

Eu3+-doped ZrO2 nanostructures in the form of rods, stars, and hollow spheres were prepared by varying hydrothermal conditions. X-ray diffraction, transmission electron microscope, ultraviolet-visible diffuse reflection spectroscopy, low-temperature nitrogen adsorption method, Raman spectroscopy and photoluminescence spectra were used to characterize the polymorph modification, surface and optical properties of the Zr0.98Eu0.02O2 nanophosphors. The Eu3+ content in a zirconia monoclinic lattice, remained constant for all types of obtained nanostructures in order to reveal the morphology influence on the efficiency of electronic excitation energy transfer from the host matrix to photoactive centers. The decrease of average size of the coherent scattering regions in the series rods —> stars —> hollow spheres, is associated with increasing the specific surface area values. At that, in the photoluminescence spectrum, the splitting of the sublevels associated with the monoclinic lattice 5D0 —> 7F1 disappears.

Keywords: hydrothermal synthesis, monoclinic zirconia, europium, solid solution, rods, stars, hollow spheres, nanocrystals, energy gap, photoluminescence, lifetime.

PACS 78.67. n; 78.67.Bf

DOI 10.17586/2220-8054-2019-10-6-654-665


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